A few questions about Responsive Shop Theme

Hi, I’m looking for a fairly simple shopping cart and am considering Responsive Shop Theme as I am very familiar with Directory Theme. I have a few questions that hopefully can be easily answered by some of you who have used the Shop Theme.

1. Is it possible to calculate shipping based on total weight of the order?

2. Is it easy to set up payment by Paypal?

3. Has anyone successfully used Sagepay in the UK?

4. Is it easy to set up products with attributes eg. colour and size?

5. Does it handle stock control well and is it easy to set up discounts and discount codes?

6. Are there any other easy to setup shopping carts that are worth considering if I don’t use this one?

Any advice on this greatly appreciated.